[MAPREDUCE-4458] Warn if java.library.path is used for AM or Task

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.3, 2.0.2-alpha, 3.0.0-alpha1
• Fix Version/s: 2.0.3-alpha, 0.23.7
• Component/s: mrv2
• Assignee: Robert Parker
• Reporter: Robert Joseph Evans
• Created: 18/Jul/12 21:49
• Updated: 12/May/16 18:23
• Resolved: 18/Jan/13 23:05

Description

If java.library.path is used on the command line for launching an MRAppMaster or an MR Task, it could conflict with how standard Hadoop/HDFS JNI libraries and dependencies are found. At a minimum the client should output a warning and ask the user to switch to LD_LIBRARY_PATH. It would be nice to automatically do this for them but parsing the command line is scary so just a warning is probably good enough for now.